For the purpose of the protection from the noise induced deafness and the disturbance of the blood circulation to hand by noise and vibration for the workers using chain saw, a new type of the chain saw attachment was produced, which was fixed to the tree to cut off and worked by a remote controlled handle.
The intensity of the noise to the ear and the intensity of the vibration to the handle were measured using a sound meter and a special pick up which was attached to the chain saw handle.
Comparing to the ordinary chain saw, the distance between the ear and the source of the noise was reduced only 1.5 meter, so the reduction of the intensity of the noise was only 4 1dB in A specificity, and it overed 95 dB under which noise level was recommended to the health of the workers. So it should be designed to have a much more reduction of the noise.
The intensity of the vibration was reduced remarkably, it valued to any direction under 0.7 G., 117 dB. About the intensity of vibration, it was recommended under 3 G to the health of the workers using the vibrating machine, so this new machine was effective to the reduction of the intensity of the vibraion.
